This volume is the outcome of the second series of Swiney Lectures on Geology which I delivered at the Victoria and Albert Museum in London in 1908. The subject chosen for these lectures was the Geological History of the American Fauna. Instead of publishing the lectures, like the previous ones on the European Fauna, with little alteration, I decided to amplify and rewrite them completely. In doing so I was enabled to bring out more clearly certain points in the geological history of the American animals which seemed to me of general interest.
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